SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86c6f2f651176a25ec17a5658b865abca9a87e69964fe144319247b3595be10' 
  AND token = 'DElMKQ9xDHYqKUNTWBJt7LXwmPvRU754W/Glyl/IoHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}